JavaPython:Sõnastikud

Java vs Python

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Pythoni sõnastikud on sarnased Java "map"-idele.

A HashMap is like a Python dictionary, but uses only object syntax. There are no literals. Declaration and creation look like:

HashMap<keyType, valueType> variable = new HashSet<keyType, valueType>();

Some methods:

type put(key, value) (returns previous value), type get(key), boolean containsKey(key).

Näide

Java

Python

<syntaxhighlight lang="java" line="1" > HashMap<String, String> phoneBook = new HashMap<String, String>(); phoneBook.put("Mike", "555-1111"); phoneBook.put("Lucy", "555-2222"); phoneBook.put("Jack", "555-3333"); //iterate over HashMap Map<String, String> map = new HashMap<String, String>(); for (Map.Entry<String, String> entry : map.entrySet()) { System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); } //get key value phoneBook.get("Mike"); //get all key Set keys = phoneBook.keySet(); //get number of elements phoneBook.size(); //delete all elements phoneBook.clear(); //delete an element phoneBook.remove("Lucy"); </syntaxhighlight>

<syntaxhighlight lang="python" line="2" > create an empty dictionary phoneBook = {} phoneBook = {"Mike":"555-1111", "Lucy":"555-2222", "Jack":"555-3333"} iterate over dictionary for key in phoneBook: print(key, phoneBook[key]) add an element phoneBook["Mary"] = "555-6666" delete an element del phoneBook["Mike"] get number of elements count = len(phoneBook) can have different types phoneBook["Susan"] = (1,2,3,4) return all keys print phoneBook.keys() delete all the elements phoneBook.clear() </syntaxhighlight>